US5176198A - Molten metal feed in a strip caster - Google Patents
Molten metal feed in a strip caster Download PDFInfo
- Publication number
- US5176198A US5176198A US07/657,852 US65785291A US5176198A US 5176198 A US5176198 A US 5176198A US 65785291 A US65785291 A US 65785291A US 5176198 A US5176198 A US 5176198A
- Authority
- US
- United States
- Prior art keywords
- launder
- molten metal
- nozzle
- casting
- mobile
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0637—Accessories therefor
- B22D11/064—Accessories therefor for supplying molten metal
Definitions
- the invention relates to a method for feeding molten metal, in particular molten aluminum or a molten aluminum alloy, by means of a nozzle which is horizontally displaceable and vertically adjustable on a carriage, into the adjustable roll gap of two casting rolls of a horizontal strip caster, the feeding of the nozzle being interrupted for the exchange or cleaning thereof, and the carriage being removed from and returned to the region of the casting rolls.
- the invention also relates to a strip caster for carrying out the method.
- Known horizontal strip casters possess, in accordance with a first alternative embodiment, two casting rolls arranged one above the other (e.g. LAUENER Roll Caster), and in accordance with a second alternative embodiment two casting belts (e.g. HAZELETT) or caterpillar molds (e.g. LAUENER Block Caster) rotating one above the other, which are retained by a machine frame or are arranged in a housing.
- two casting belts e.g. HAZELETT
- caterpillar molds e.g. LAUENER Block Caster
- a nozzle In the region of the roll gap or casting gap, a nozzle is situated in the working position between the two casting rolls and is generally fixed to the machine frame.
- a casting trough also referred to as a molten metal distribution trough, fed by a casting launder system conducts liquid metal into the nozzle.
- this nozzle can be installed and removed together with its nozzle holder, accessibility is greatly impeded, particularly by a machine frame.
- U.S. Pat. No. 4,577,672 (corresponding to French Patent 2,534,500) describes a nozzle unit which is independent of the remainder of the horizontal strip caster and permits precise positioning of the nozzle with reference to the casting gap.
- This nozzle unit is arranged on a nozzle beam, which is mounted on a carriage that can be moved in the casting direction by a drive.
- the nozzle can also be displaced in the vertical direction.
- the horizontal and vertical movements have a fine adjustment which permits exact positioning of the nozzle. This is particularly advantageous during a nozzle change or cleaning of the nozzle, since the nozzle can be removed from the region of the casting rolls for this purpose and repositioned precisely after the necessary work.
- the object of the present invention is to provide a method and an apparatus of the type referred to initially which, during horizontal strip casting, permit a change of nozzle or cleaning of the nozzle within a period of considerably less than one hour. This means in practice that a nozzle virtually always has to be exchanged for cleaning. It also means that the necessary free space for exchanging or cleaning the nozzle has to be created.
- the object is achieved according to the invention, in that the metal feed from a stationary launder into a mobile launder and/or into a molten metal distribution trough of the nozzle is continued even during an interruption in casting.
- the molten metal feed is preferably continued unchanged during an interruption of casting.
- the casting can be continued after the interruption with molten metal of virtually unchanged temperature.
- the metal level in the molten metal distribution trough and an assigned mobile launder rises continuously with the nozzle closed, until it preferably flows away through an overflow or through an outflow flap and is collected in a collection tank. From this collection tank, which is expediently insulated, the liquid metal can again be returned to the smelting or holding furnace.
- the overflow prevents all-round, uncontrolled overflowing of the molten metal distribution trough and of an assigned mobile launder.
- a defective or blocked nozzle which is withdrawn from the roll space is replaced by a new nozzle of the same geometric dimensions or cleaned on the spot, though this latter expedient is only possible in exceptional cases in practice.
- the new or cleaned nozzle is reproducibly returned to exactly the same position.
- the nozzle may also be changed deliberately in the event of a program change which requires a different width and/or thickness of the cast strip. In this case, the nozzle is returned to a different position determined by program control.
- the operations of retracting and/or repositioning of the nozzle could be carried out completely or partly by hand, for example by means of spindles actuated by a hand wheel, particularly for fine adjustment, the retraction and reproducible or precalculated positioning of the nozzle is preferably completely automated.
- the precalculated new positioning expediently entails a simultaneous, program controlled change of the roll gap, for example as described in EP-A1 0309394.
- the mobile launder is displaced in the longitudinal direction or is slightly displaced in its longitudinal direction and swung laterally, for example through about 90°.
- the axis of rotation lies in the region of the outflow from the stationary launder, so that the liquid molten metal fed in without interruption does not flow adjacent to it.
- the mobile launder is first retracted slightly and then swung, while for repositioning it is first swung and then pushed slightly forward.
- the quantity of molten metal fed per unit of time using floats or contact-free sensors to measure the level.
- the object is achieved according to the invention in that the strip caster comprises a stationary launder with an outflow which can be closed by an adjustable plug and is situated in the region of the end face, and a mobile launder arranged below the outflow on a carriage so as to be capable of longitudinal displacement, or longitudinal displacement and lateral swivelling, and having a molten metal distribution trough for the nozzle which is separated by an adjustable aperture, the outflow from the stationary launder always remaining above the mobile launder in the event of longitudinal displacement and/or lateral swivelling of the latter.
- This system of launders situated one above the other ensures that the liquid molten metal can always flow into the mobile launder with the molten metal distribution trough, even after the retraction of the nozzle, thus preventing cooling-down.
- measuring instruments In order to measure the level of the metal, measuring instruments, preferably connected to a computer, are arranged in the stationary launder, the mobile launder and the molten metal distribution trough, and permit the adjustment of the plug of the stationary launder and the aperture from the mobile launder to the molten metal distribution trough under program control.
- the plug and the aperture are set to the programmed positions and the flow of metal is monitored by continuous or periodic level measurements.
- the carriage for the longitudinally displaceable and vertically adjustable nozzle which nozzle is not per se a subject of the invention, is guided on a support or carrier which possesses play-free vertical and horizontal guides.
- a support or carrier which possesses play-free vertical and horizontal guides.
- stops which can be adjusted manually or under program control, to limit the hydraulic, pneumatic or mechanical displacement of the carriage.
- FIG. 1 shows a layout of a plant for horizontal strip casting
- FIG. 2 shows a plan view of a casting nozzle with the molten metal feed according to the known state of the art
- FIG. 3 shows a plan view of a casting nozzle with the molten metal feed according to the invention
- FIG. 4 shows a perspective view of a metal feed and a strip caster in the working position
- FIG. 5 shows a partially sectioned part view of a strip caster in the working position
- FIG. 6 shows a partially sectioned view of a strip caster with the nozzle retracted
- FIG. 7 shows an alternative embodiment of the overflow in FIG. 6.
- the strip casting installation which is shown in principle in FIG. 1 indicates the essential components of the installation and the metal strip produced.
- the tiltable furnaces 10, 12 can be optionally used as casting or heat-retention furnaces, the latter also being referred to for short as a holding furnace, but one of the furnaces 10, 12 is always the casting furnace and the other the heat-retention furnace.
- the liquid molten metal flows from the heat-retention fur]ace 10 or 12 into a casting launder system 14 which leads first to a filter system 16 and then to the horizontal strip caster 18, also referred to simply as a caster.
- the filter system 16 comprising at least one filter, serves to remove gaseous components and/or solid particles.
- the strip caster 18 encompasses two casting belts or caterpillar molds, rotating one above the other, but preferably two casting rolls arranged one above the other.
- the cast metal strip 20 is, in the present case, guided over a dancer roll (not shown) through a shearing unit 22 with a strip guide to a coiler 24. Particularly in the case of a strip caster with rotating casting belts or caterpillar molds, the cast metal strip 20 is hot-rolled before entering the shearing unit 22.
- control console 26 with a processor is indicated, this recording the measurements for all sections of the installation, comparing the actual values with the target values, controlling the adjusting members of sections of the installation, and storing, analysing and displaying data.
- FIG. 2 illustrates the end face of the casting launder system 14 in the direction of the strip caster 18 (FIG. 1), a molten metal distribution trough 28 and a nozzle 30 in the working position, in accordance with the known conventional state of the art.
- the liquid molten metal flows through a controllably closeable outflow 32 into the molten metal distribution trough 28.
- the aperture between the molten metal distribution trough 28 and the nozzle 30 (not shown) is likewise closeable.
- FIG. 3 shows the components of the present invention, corresponding to FIG. 2, the nozzle 30 again being in the working position.
- the end of the conventional casting launder system 14 towards the nozzle 30 is not designed to be either liftable or capable of being swung to the side, and is referred to as the stationary launder 34.
- a mobile launder 36 which can be moved back with the nozzle 30 in the longitudinal direction L.
- the outflow 32 from the stationary launder 34 always remains above the mobile launder 36.
- the latter in respect of cross-section, is of equal size to or, as in the present illustrative embodiment, somewhat smaller than the stationary launder 34.
- the molten metal treatment trough 28, also referred to as a "head box” and the mobile launder 36 have the smallest volume possible.
- a controllably closeable aperture Arranged between the mobile launder 36 and the molten metal distribution trough 28 is a controllably closeable aperture which is described later in detail.
- the perspective illustration according to FIG. 4 shows a strip caster 18 with an incoming casting launder system 14 which is filled with liquid molten metal 15.
- the strip caster 18 is designed without a housing, as is described in detail, for example, in U.S. Pat. No. 4,567,933.
- the retaining frames 38, 40 for the casting rolls 42, 44 are connected to each other via a pre-tensioning device 46.
- the casting rolls 42, 44 are internally cooled, the coolant medium being fed in and removed via hoses 48.
- the casting rolls 42, 44 are also driven by individual motors 50, 52, which are synchronized.
- the mobile launder 36 which is arranged below the stationary launder 34 and is displaceable in the direction of flow of the molten metal 15 or in the longitudinal direction L, also encompasses the molten metal distribution trough 28 of the same cross-section, which is isolated by a partition wall 54 provided with a controllably closeable aperture, which is not shown.
- the mobile launder 36 with the molten metal distribution trough 28 is supported on a carriage 56 which possesses horizontal, lateral guide strips 58 in the longitudinal direction L. These are displaceable without play in corresponding grooves of a support 60, which are not shown.
- the support 60 is adjustable in respect of height in the vertical direction, which is not apparent from FIG. 4.
- This support 60 is also of relatively small horizontal cross-section particularly in the longitudinal direction L, so that the maximum possible free space is obtained in the region of the casting rolls 42, 44 when the mobile launder 36 is retracted. This is particularly important if the rolls are externally cooled.
- the support 60 can be swung laterally by means of a mechanism of a construction known per se, which is not shown but is indicated by an arrow 61.
- the mobile launder 36 with the molten metal distribution trough 28 can be swung through any desired angle, after the mobile launder 36 has been slightly retracted in the longitudinal direction L in order to maintain the necessary free space, or before it is pushed slightly forward again.
- FIG. 5 shows only the casting rolls 42,44 of the actual strip caster 18 (FIGS. 1, 2), which form a roll gap w.
- the nozzle 30, which can be removed from the molten metal distribution trough 28, is introduced into the space between the casting rolls 42, 44, that is to say in the working position, and is supported by a nozzle support 62.
- the molten metal 15 passed into the roll gap w can be interrupted by lowering a slide 64 if the nozzle 30 has to be retracted.
- the rearmost part of the mobile launder 36 in the direction of flow F of the molten metal 15 forms the molten metal distribution trough 28, which is isolated by a partition wall 54 having an aperture 66.
- This aperture can be controllably closed by means of a flap 68 with a truncated cone 70 at its end.
- the swinging movement of the flap 68 is indicated by an arrow 76.
- the metal level 72 in the mobile launder 36 is therefore higher than the metal level 74 in the molten metal distribution trough 28.
- the liquid molten metal 15 passing through the outflow 32 from the stationary launder 34 into the mobile launder 36 is regulated by a plug 78 which is displaceable in the vertical direction in the direction of the arrow 80.
- Both the stationary launder 34 and the mobile launder 36 with the molten metal distribution trough 28 are lined with a refractory insulating layer 82.
- the metal level 84 in the stationary launder 34 is monitored, like the metal level 72, 74 in the mobile launder 36 and the molten metal distribution trough 28, by floats or contact-free sensors which are not shown for the sake of simplicity. Both methods are known per se.
- the signals generated are proportional to the vertical position of the float or to the distance between sensor and metal surface. These signals are processed and transmitted to a processor or computer, where the actuation of adjusting members is triggered, which adjusting members control the metal feed in accordance with the measured metal levels 72, 74, 84.
- the adjusting members are, for example, the plug 78 and the flap 68.
- the broken lines indicate the position of the retracted nozzle 30 with the mobile launder 36 and the carriage 56.
- the support 60 is carried by a pedestal 90, which is fixedly anchored in the floor 92.
- the mobile launder 36 has an outflow 94 for the removal of the liquid molten metal after the end of the casting operation, which can last up to about 10 days.
- FIG. 6 shows a strip caster 18 arranged on a base plate 96, the retaining frames 38, 40, the casting rolls 42, 44 and the pre-tensioning device 46 of this strip caster 18 being indicated.
- the mobile launder 36 with the molten metal distribution trough 28 and the nozzle 30 detachably attached thereto are retracted, and the slide 64 is closed.
- the mobile launder 36 and the molten metal distribution trough 28 are separated by a pivotable flap 98, which forms an adjustable aperture.
- a float 100 monitoring the metal level 74 is also indicated in the molten metal distribution trough 28.
- the casting operation is interrupted.
- the liquid molten metal 15 is, however, fed via the stationary launder 34 in the same quantity per unit of time.
- the metal levels 72, 74 in the mobile launder 36 and the molten metal distribution trough rise because the nozzle is sealed by the slide 64.
- An overflow 102 prevents the molten metal 15 from flowing uncontrollably over the edge of the mobile launder 36 and of the molten metal distribution trough 28.
- a pipe 104 passes the outflowing molten metal 15 into a collecting tank 106.
- An overflow is likewise present, of course, in the illustrative embodiment according to FIG. 5, but this is shown only in FIG. 6 for reasons of clarity.
- FIG. 7 substantially corresponds to FIG. 6, but the overflow 102 is arranged in the region of the molten metal distribution trough 28, as is preferentially the case.
- the overflowing metal 15 flows via a launder 103 into an insulated collecting tank 106, which can also be of closed design.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
- Braking Arrangements (AREA)
- Casting Devices For Molds (AREA)
Abstract
Description
Claims (9)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH00528/90 | 1990-02-19 | ||
CH00528/90A CH688507A5 (en) | 1990-02-19 | 1990-02-19 | Metallschmelzezufuehrung in a strip caster. |
Publications (1)
Publication Number | Publication Date |
---|---|
US5176198A true US5176198A (en) | 1993-01-05 |
Family
ID=4189069
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/657,852 Expired - Fee Related US5176198A (en) | 1990-02-19 | 1991-02-19 | Molten metal feed in a strip caster |
Country Status (10)
Country | Link |
---|---|
US (1) | US5176198A (en) |
EP (1) | EP0443204B1 (en) |
JP (1) | JP2863333B2 (en) |
KR (1) | KR910021272A (en) |
AT (1) | ATE102099T1 (en) |
BR (1) | BR9100658A (en) |
CA (1) | CA2036557C (en) |
CH (1) | CH688507A5 (en) |
DE (1) | DE59004803D1 (en) |
ES (1) | ES2050931T3 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5518064A (en) * | 1993-10-07 | 1996-05-21 | Norandal, Usa | Thin gauge roll casting method |
US5755274A (en) * | 1993-05-18 | 1998-05-26 | Pechiney Rhenalu | Strip casting plant for metals |
US20090004044A1 (en) * | 2007-06-29 | 2009-01-01 | Fujifilm Corporation | Method and apparatus for manufacturing aluminum alloy strip for lithographic printing plates |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2737430B1 (en) * | 1995-08-03 | 1997-09-05 | Pechiney Rhenalu | METHOD AND DEVICE FOR STARTING A CONTINUOUS CASTING MACHINE BETWEEN CYLINDERS |
CN108580864B (en) * | 2018-07-02 | 2023-11-21 | 聊城信源集团有限公司 | Anode carbon block assembled ferrophosphorus casting system |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2348178A (en) * | 1937-11-03 | 1944-05-02 | Joseph M Merle | Method of making metallic products of sheetlike form |
US2639490A (en) * | 1948-08-12 | 1953-05-26 | Joseph B Brennan | Formation of metal strip under controlled pressures |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1198006A (en) * | 1958-01-31 | 1959-12-04 | Pechiney Prod Chimiques Sa | Continuous metal casting |
US3467284A (en) * | 1967-05-24 | 1969-09-16 | Bethlehem Steel Corp | Distributor for continuous casting machine |
CH658208A5 (en) * | 1982-10-18 | 1986-10-31 | Alusuisse | DEVICE FOR FEEDING A MEL BETWEEN TWO CASTING ROLLERS OF A ROLLING CASTING SYSTEM. |
JPH01309761A (en) * | 1988-06-08 | 1989-12-14 | Ishikawajima Harima Heavy Ind Co Ltd | Apparatus for pouring molten metal in shifting mold type continuous casting machine |
JPH01313158A (en) * | 1988-06-10 | 1989-12-18 | Ishikawajima Harima Heavy Ind Co Ltd | Device for centering pouring nozzle in continuous casting equipment |
-
1990
- 1990-02-19 CH CH00528/90A patent/CH688507A5/en not_active IP Right Cessation
- 1990-12-28 ES ES90125676T patent/ES2050931T3/en not_active Expired - Lifetime
- 1990-12-28 AT AT90125676T patent/ATE102099T1/en active
- 1990-12-28 EP EP90125676A patent/EP0443204B1/en not_active Expired - Lifetime
- 1990-12-28 DE DE90125676T patent/DE59004803D1/en not_active Expired - Fee Related
-
1991
- 1991-02-18 CA CA002036557A patent/CA2036557C/en not_active Expired - Fee Related
- 1991-02-19 KR KR1019910002635A patent/KR910021272A/en not_active Application Discontinuation
- 1991-02-19 BR BR919100658A patent/BR9100658A/en not_active IP Right Cessation
- 1991-02-19 JP JP3046060A patent/JP2863333B2/en not_active Expired - Fee Related
- 1991-02-19 US US07/657,852 patent/US5176198A/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2348178A (en) * | 1937-11-03 | 1944-05-02 | Joseph M Merle | Method of making metallic products of sheetlike form |
US2639490A (en) * | 1948-08-12 | 1953-05-26 | Joseph B Brennan | Formation of metal strip under controlled pressures |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5755274A (en) * | 1993-05-18 | 1998-05-26 | Pechiney Rhenalu | Strip casting plant for metals |
US5518064A (en) * | 1993-10-07 | 1996-05-21 | Norandal, Usa | Thin gauge roll casting method |
US5584336A (en) * | 1993-10-07 | 1996-12-17 | Norandal, Usa | Thin gauge roll casting method |
US20090004044A1 (en) * | 2007-06-29 | 2009-01-01 | Fujifilm Corporation | Method and apparatus for manufacturing aluminum alloy strip for lithographic printing plates |
US8048364B2 (en) * | 2007-06-29 | 2011-11-01 | Fujifilm Corporation | Method and apparatus for manufacturing aluminum alloy strip for lithographic printing plates |
US8366842B2 (en) | 2007-06-29 | 2013-02-05 | Fujifilm Corporation | Method and apparatus for manufacturing aluminum alloy strip for lithographic printing plates |
Also Published As
Publication number | Publication date |
---|---|
DE59004803D1 (en) | 1994-04-07 |
CH688507A5 (en) | 1997-10-31 |
EP0443204B1 (en) | 1994-03-02 |
JPH04279256A (en) | 1992-10-05 |
JP2863333B2 (en) | 1999-03-03 |
KR910021272A (en) | 1991-12-20 |
ATE102099T1 (en) | 1994-03-15 |
BR9100658A (en) | 1991-10-29 |
ES2050931T3 (en) | 1994-06-01 |
CA2036557C (en) | 2002-04-09 |
CA2036557A1 (en) | 1991-08-20 |
EP0443204A1 (en) | 1991-08-28 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: LAUENER ENGINEERING LTD., A CORP OF SWITZERLAND, S Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:FRISCHKNECHT, BRUNO;RODER, RUDOLF;REEL/FRAME:005655/0132 Effective date: 19910204 |
|
FPAY | Fee payment |
Year of fee payment: 4 |
|
AS | Assignment |
Owner name: PECHINEY RHENALU TOUR MANHATTAN, FRANCE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LAUENER ENGINEERING AG;REEL/FRAME:008246/0240 Effective date: 19961028 |
|
AS | Assignment |
Owner name: PECHINEY RHENALU, FRANCE Free format text: CORRECTIVE ASSIGNMENT TO CORRECT NAME OF THE ASSIGNEE AND THE BUSINESS ADDRESS OF THE ASSIGNEE PREVIOUSLY RECORDED ON REEL 8246, FRAME 0240;ASSIGNOR:LAUENER ENGINEERING AG;REEL/FRAME:008792/0216 Effective date: 19970901 |
|
FPAY | Fee payment |
Year of fee payment: 8 |
|
REMI | Maintenance fee reminder mailed | ||
LAPS | Lapse for failure to pay maintenance fees | ||
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
|
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20050105 |